It's a snatch grip.
You would be surprised at how much you truely use it. It is handy and helpful.
I don't believe its worth $20 to have it but its a nice upgrade.
It also comes with a new screw and it mounts very well.

Also it looks really good and make my Imp look like an Ego in the shadow...

Conclusion:

Great product, if you are looking for a snatch grip then this is what you want.